Cross-head for steam-engines



(N0 Model.)

Patented Sept. 25, 1888.

Jill/mu ATTORNEY B V A WITNESSES:

N. PETERS. Pholu-IJ! Wimphe UNITED STATES PATENT OFFICE.

FRANK ROBB, OF ST. JOHNS, MICHIGAN.

CROSS-HEAD FOR STEAM=ENGINES.

SPECiFICATION forming part of Letters Patent No. 389,978, dated September 25, 1888.

Application filed March 16, 1888. Serial No. 267,376. (No model.)

To all whom it mdy concern..-

Be it known that I, FRANK Rose, of St. Johns, in the county of Clinton and State of Michigan, have invented a newand Improved Cross-Head for Steam-Engines, of which the following is a full, clear, and exact descrip tion.

The object of the invention is to provide a new and improved cross-head for steam-engines which is simple and durable in construction and easily and quickly adjusted to take up all wear 011 the ways.

The invention consists of a cross-head pro vided on each side with a bearing made in two parts, of which one part is rigid on the cross head and the other is dovetailed andslides on the rigid part, and ofsct-screws for adjusting the sliding part.

The invention also consists of certain parts and details and combinations of the same, as will be fully described hereinafter,and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this Specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of the improvement. Fig. 2 is a plan view of the same with a part removed. Fig. 3is an under side View of the dovetailed bearing of the cross head. Fig. 4 is a sectional end elevation of the improvement, showing the ways in section.

The cross-head Ais secured to the outer end of the piston-rod B, and at its outer end is pivotally connected with the pitman O in the usual manner. The crosshead A is held to slide in the usual ways, D, (shown in Fig. 4,) by the bearings E E, formed on each side of the cross head. Each of the bearings E consists, principally, of two parts, F and G, of which the part F is rigid with the body of the crosshead A, and is provided on top, near the ends, with two or more vertically-dovetailed lugs or offsets,H. onto which fit similar dovetailed lugs or olfsets, l, formed on the under side of the part G oft-he bearing E,which part G is thus held to slide vertically on the said dovetailed lugs or offsets H on the part F. 'When the parts F and G are fitted together, then the partGis permitted to slide vertically on the part F,'but is prevented from sidewise or endwise movement by the dovetailed lugs or offsets H.

Into the top of the rigid part F of the hearing E screw the bolts J, one being preferably located near each end and one in the middle, as shown in Figs. 1 and 2. The heads K of the bolts J support thepart G of the bearing, and each bolt is locked in place, after being adjusted, by ajam-nut, L, screwing on the bolt J and against the top of the part F. The part G of the bearing E is fitted on the stationary part F, and then the bolts J are adjusted so that the bearings E fit snugly into the ways D of the engine, the part G being supported on the heads K of the bolts J, and the latter be ing then looked in place by the jam-nuts L.

If any wear occur on the bearings E and their guideways D, the jam-nuts are loosened and the bolts J screwed upward,so as to cause the part Gto slide upward until all the wear between bearing E and guidoways D is taken up. The jam-nuts L are then again screwed down.

It will be seen that the wear can thus be very rapidly and easily taken up without removing the cross-head from its ways, and the parts F and G of the bearing E can be used until almost used up by the wear.

Having thus described my invention, \vhatl claim as new, and desire to secure by Letters Patent, is

l. The combination, with a cross-hcad pro vided on each side with abearing made in two parts, of which one is held to slide vertically on the other, of bolts for adjusting theslidiug part of the bearing on the other part, substantially as shown and described.

2. The combination, with a eross-head provided on each side with a bearing made in two parts, of which one is held to slide vertically on the other, of bolts for adjusting the sliding part of the bearing on the other part, and jam-nuts for locking the said bolts in place, substantially as shown and described.

3. A cross-head comprising a body part provided on each side with a bearing made in two parts, of which one is rigid on the body part and the other is held to slide on the rigid part, bolts screwing in the rigid part of the bearing and against the sliding part, and jamnuts for locking the bolts in place, substantially as shown and described.

FRANK ROBB.

Witnesses:

J AMES H. CONN, FRANK CONN. 

